利用交变磁场分离空心圆柱状金属熔体中非金属夹杂

Separation of Inclusion Particles in Hollow-Cylinder Like Melt Using Alternating Electromagnetic Field

对空心圆柱熔体中非金属夹杂的电磁分离过程进行了动力学分析 ,通过解析法计算得出了无量纲数 r1/δ、磁感应强度 Be、电磁力作用时间 t和颗粒粒径 dp 等与夹杂分离效率 η的关系 .结果表明 ,采用空心圆柱形状 ,可以使实心圆柱熔体大部分区域受力较弱的情况得到改善 ,提高分离效率 ;取频率 f=1 0～ 1 5k Hz、r1/δ=1 .5～ 2时 ,可获得最大电磁分离效率 ;对粒径小于 5μm的夹杂颗粒 ,电磁分离作用不显著 ;磁感应强度和电磁力作用时间的最佳取值范围是 t>5s、Be>0 .1 T.

Effects of various variables such as imposed magnetic flux density, imposed time, the diameter of inclusions, and non-dimensional parameter r1/δ on the removal efficiency of inclusion separation in hollow-cylinder like melt using alternating electromagnetic field were analyzed and illustrated. It is found that higher removal efficiency can be obtained in hollow-cylinder like melt than cylinder like case under the same conditions. Removal efficiency reaches maximum when the frequency ranges from 10 to 15 kHz and r1/δ ranges from 1.5 to 2. Inclusion particles with diameter smaller than 5 μm cannot be removal easily in this case. The numeric range of magnetic flux density should be more than 0.1 T, and the value of imposed time should be more than 5 s.